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W: You look tired. Have you been exercising?M: Yes. We’ve just had a basketball match against Class Two.W: Who won?M: They did.W: What was the score?M: Seventy to sixty-seven. Susan, do you like playing basketball?W: No, actually I just like watching it.M: Do you still take a long-distance run every day?W: No, just sometimes.M: It’s a very good exercise.

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M: Amy, what’s your favorite sport?W: Err, that’s hard to say. But I like running.M: You run very fast, don’t you?W: Yes, but not the fastest. Lily runs much faster than I.M: Really?W: Yes. In our class, Lily runs the fastest of all. What about you, Steven?What do you like?M: You like running, but I like jumping, both the high jump and the long jump.W: Did you take part in the sports meeting last year?M: Yes. I took part in high and long jumps and won the first prize in the long jump last year.W: You are also going to attend this year’s long jump contest, right?M: Yeah! I’ll try to make a better record.W: Good luck!

下列（）不是煤矿井下供电系统的三大保护。

A. 保护接地
B. 漏电保护
C. 过流保护
D. 过电压保护

工作电压为1140V时，漏电保护装置的动作电阻整定值为（）

A. 20kΩ
B. 30kΩ
C. 40kΩ
D. 50kΩ

漏电保护通常采用、及工作方式。